scholarly journals A Low-Cost Programmable High-Frequency AC Electronic Load with Energy Recycling for Battery Module Diagnostics

2020 ◽  
Vol 10 (2) ◽  
pp. 546
Author(s):  
Chang-Hua Lin ◽  
Kun-Feng Chen ◽  
Kai-Jun Pai ◽  
Kuan-Chung Chen
Keyword(s):  
High Frequency ◽  
Low Cost ◽  
Electrical Energy ◽  
Diagnostic Process ◽  
Recycling Rate ◽  
Resonant Circuit ◽  
Wide Range ◽  
Electronic Load ◽  
High Frequency Ac ◽  
Battery Module

A low-cost programmable high-frequency alternating current (AC) electronic load for battery module diagnosis which possesses energy recycling and portability is proposed. The proposed AC electronic load consists of a micro-controller, a signal capturing circuit, and a resonant circuit, and can be integrated with a human–machine interface (HMI). To diagnose the dynamic characteristics of a lithium battery module, the proposed AC electronic load is served as a test load for providing a wide-range slew-rate loading function. In this study, the extracted energy from the tested battery module during the diagnostic process can be recycled to save energy. In addition, all of the battery module parameters and test conditions can be preset in the HMI, and the battery characteristics and the recycling rate of the electrical energy also can be estimated. Analysis of operation modes and simulations and some experimental results are used to verify the theoretical predictions.

scholarly journals A Comparative Analysis of Half-Bridge LLC Resonant Converters Using Si and SiC MOSFETs

2021 ◽  
Vol 12 (1) ◽  
pp. 43
Author(s):  
Hasaan Farooq ◽  
Hassan Abdullah Khalid ◽  
Waleed Ali ◽  
Ismail Shahid
Keyword(s):  
Silicon Carbide ◽  
Renewable Energy ◽  
High Frequency ◽  
High Efficiency ◽  
Low Voltage ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Input Voltage ◽  
Resonant Converters ◽  
Wide Range

With the expansion of renewable energy sources worldwide, the need for developing more economical and more efficient converters that can operate on a high frequency with minimal switching and conduction losses has been increased. In power electronic converters, achieving high efficiency is one of the most challenging targets to achieve. The utilization of wideband switches can achieve this goal but add additional cost to the system. LLC resonant converters are widely used in different applications of renewable energy systems, i.e., PV, wind, hydro and geothermal, etc. This type of converter has more benefits than the other converters such as high electrical isolation, high power density, low EMI, and high efficiency. In this paper, a comparison between silicon carbide (SiC) MOSFET and silicon (Si) MOSFET switches was made, by considering a 3KW half-bridge LLC converter with a wide range of input voltage. The switching losses and conduction losses were analyzed through mathematical calculations, and their authenticity was validated with the help of software simulations in PSIM. The results show that silicon carbide (SiC) MOSFETs can work more efficiently, as compared with silicon (Si) MOSFETs in high-frequency power applications. However, in low-voltage and low-power applications, Si MOSFETs are still preferable due to their low-cost advantage.

Energy Scavenging

2003 ◽  
Vol 34 (10) ◽  
pp. 7-9 ◽  
Keyword(s):  
Wireless Sensors ◽  
Low Cost ◽  
Electrical Energy ◽  
Embedded Sensors ◽  
Energy Scavenging ◽  
Medical Implants ◽  
Wide Range ◽  
Recent Developments ◽  
Natural Temperature

Recent developments in micro electromechanical systems (MEMS) point towards a wide range of applications for a new breed of integrated wireless sensors. Applications include embedded sensors in “smart” buildings, for example vibration and temperature monitoring, medical implants and remote sensing. The new devices, which will communicate by microwatt power, short range radio (picoradio), have been compared with communicating neurons. The vision is that hundreds, or even thousands of small independent, low cost devices will be built into, say, a building, producing a powerful, interlinked network of information transmission. But they require a long- term power source, which can be a significant problem. The limitations of batteries have led to interest in scavenging by conversion of another form into electrical energy. Possible energy sources are solar, body functions such as breathing, natural temperature gradients etc. This article considers energy scavenging from vibration.

Oxhydroelectric Effect: Electricity from Water by Twin Electrodes

2011 ◽  
Vol 495 ◽  
pp. 100-103 ◽  
Author(s):  
Roberto Germano ◽  
Valentino Tontodonato ◽  
Cornelia Hison ◽  
Domenico Cirillo ◽  
F.P. Tuccinardi
Keyword(s):  
Potassium Carbonate ◽  
Low Cost ◽  
Experimental System ◽  
Electrical Energy ◽  
New Paradigm ◽  
Dc Power ◽  
Pt Electrodes ◽  
Wide Range ◽  
Hydrophilic Material ◽  
Potassium Carbonate Solution

Electricity extraction from water by twin electrodes, mediated by oxygen molecules, that we call Oxhydroelectric Effect, is reported. The extremely simple components of this experimental system are: two platinum (Pt) wire electrodes, a saturated solution of potassium carbonate (K2CO3) in water (H2O) (with pH >10) as electrolyte, and a film of hydrophilic material (Nafion®). A dc power of the order of hundredths of nW was measured for days through a resistor connected to the twin Pt electrodes. The addition of a very small amount of hydrogen peroxide (H2O2) to the electrolyte (water-potassium carbonate solution with only 0.004% H2O2), as a source of oxygen, determines an immediate dc power jump, more than two orders of magnitude high, lasting for days. The Oxhydroelectric Effect opens the way to a completely new paradigm in what concern low-cost electrical energy generating systems, with a tremendously wide range of possible applications.

scholarly journals A practical microwatt-meter for electrical energy measurement in programmable devices

2018 ◽  
Vol 51 (9-10) ◽  
pp. 383-395 ◽  
Author(s):  
Mohammad Y Al-Shorman ◽  
Majd M Al-Kofahi ◽  
Osameh M Al-Kofahi
Keyword(s):  
Power Consumption ◽  
Low Cost ◽  
Electrical Energy ◽  
Single Step ◽  
Conservation Of Energy ◽  
Wide Range ◽  
Field Programmable ◽  
Programmable Gate Arrays ◽  
Programmable Devices ◽  
High Level

Background: In this work, an accurate low-cost power microwatt-meter is designed, built, and tested. This microwatt-meter is found to be capable of measuring power consumption in a wide range of devices and sensors, such as nodes in wireless sensor networks, microcontrollers in Internet of Things devices, and Field Programmable Gate Arrays. Methods: The paper examines the usage of the microwatt-meter for the measurement of power consumption in digital devices as they execute program instructions, ranging from a low-level single step (instruction) in an assembly program to a high-level sophisticated program or system. Results: The results obtained showed that the microwatt-meter is highly accurate. It can measure the energy consumed by any of the devices/programs/instructions in a digital system with accuracy levels ranging between 0.5% and 2.5% (depending on the application). Conclusion: The accuracy of the microwatt-meter is validated using the fundamental conservation of energy law and a comparison with multimeter current measurements is presented.

Behaviour of a high-intensity discharge lamp fed by a high-frequency dimmable electronic ballast

2016 ◽  
Vol 49 (2) ◽  
pp. 277-284 ◽  
Author(s):  
A Chammam ◽  
W Nsibi ◽  
M Nejib Nehdi ◽  
B Mrabet ◽  
A Sellami
Keyword(s):  
Power Factor ◽  
High Intensity ◽  
High Frequency ◽  
Power Factor Correction ◽  
Acoustic Resonance ◽  
Operating Frequency ◽  
Resonant Circuit ◽  
Frequency Variation ◽  
Luminous Efficacy ◽  
Wide Range

The main advantages of high-frequency electronic ballasts for high-intensity discharge lamps are high luminous efficacy, small size, lightweight and longer lifetime. This is why high-intensity discharge lamps operating at high frequency are widely used. This paper proposes an approach for designing resonant circuit electronic ballasts controlled by frequency variation for high-intensity discharge lamps. The proposed technique including an AC/DC rectifier, a power factor correction circuit and a DC/AC half bridge inverter. These electronic ballasts offer a wide range of dimming controls and can avoid acoustic resonance. However, under dimming, the electric and photometric characteristics of the lamp change. In order to study these effects under the process of dimming, this work studies the lamp properties by varying both lamp power and operating frequency.

Resonant BLDC Motor Drive System for Medical Applications

2019 ◽  
Vol 14 ◽  
Author(s):  
C. Vidhya ◽  
V. Ravikumar ◽  
S. Muralidha
Keyword(s):  
High Frequency ◽  
Pulse Width Modulation ◽  
Power Converter ◽  
Low Power Consumption ◽  
Motor Drive ◽  
Medical Applications ◽  
Bldc Motor ◽  
Three Phase ◽  
High Frequency Ac ◽  
Motor Drive System

: The objective of this paper is to implement an ac link universal power converter controlled BLDC motor for medical applications. The ac link universal power converter is a soft switched high frequency ac link converter, created using the parallel combination of an inductor and a capacitor. The parallel ac link converter handle the ac voltages and currents with low reactive ratings at the link and offers improved power factor, low power consumption, more efficiency and less weight on comparison with the traditional dc link converter. Because of the high throughput, BLDC motors are preferred widely medical applications. A modulation technique called Space Vector Pulse Width Modulation (SVPWM) is used to generate the three phase power for the BLDC motors from the input DC supply. To validate the proposed system, simulations are performed in MATLAB – Simulink and an experimental prototype is constructed to supplement the simulation results.

scholarly journals Information and information resources in COVID-19: Awareness, control, and prevention

2021 ◽  
pp. 096100062110165
Author(s):  
Mohammadhiwa Abdekhoda ◽  
Fatemeh Ranjbaran ◽  
Asghar Sattari
Keyword(s):  
Low Cost ◽  
Information Resources ◽  
Age And Gender ◽  
Use Of Resources ◽  
Strategic Approach ◽  
Wide Range ◽  
Data Collection Instrument ◽  
Control And Prevention ◽  
And Gender ◽  
And Control

This study was conducted with the aim of evaluating the role of information and information resources in the awareness, control, and prevention of COVID-19. This study was a descriptive-analytical survey in which 450 participants were selected for the study. The data collection instrument was a researcher-made questionnaire. Descriptive and inferential statistics were used to analyze the data through SPSS. The findings show that a wide range of mass media has become well known as information resources for COVID-19. Other findings indicate a significant statistical difference in the rate of using information resources during COVID-19 based on age and gender; however, this difference is not significant regarding the reliability of information resources with regard to age and gender. Health information has an undisputable role in the prevention and control of pandemic diseases such as COVID-19. Providing accurate, reliable, and evidence-based information in a timely manner for the use of resources and information channels related to COVID-19 can be a fast and low-cost strategic approach in confronting this disease.

scholarly journals Advanced mycelium materials as potential self-growing biomedical scaffolds

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Maria Elena Antinori ◽  
Marco Contardi ◽  
Giulia Suarato ◽  
Andrea Armirotti ◽  
Rosalia Bertorelli ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Low Cost ◽  
Direct Interaction ◽  
Dermal Fibroblasts ◽  
Engineering Systems ◽  
Edible Fungi ◽  
Avant Garde ◽  
Fibrous Network ◽  
Body Tissues ◽  
Wide Range

AbstractMycelia, the vegetative part of fungi, are emerging as the avant-garde generation of natural, sustainable, and biodegradable materials for a wide range of applications. They are constituted of a self-growing and interconnected fibrous network of elongated cells, and their chemical and physical properties can be adjusted depending on the conditions of growth and the substrate they are fed upon. So far, only extracts and derivatives from mycelia have been evaluated and tested for biomedical applications. In this study, the entire fibrous structures of mycelia of the edible fungi Pleurotus ostreatus and Ganoderma lucidum are presented as self-growing bio-composites that mimic the extracellular matrix of human body tissues, ideal as tissue engineering bio-scaffolds. To this purpose, the two mycelial strains are inactivated by autoclaving after growth, and their morphology, cell wall chemical composition, and hydrodynamical and mechanical features are studied. Finally, their biocompatibility and direct interaction with primary human dermal fibroblasts are investigated. The findings demonstrate the potentiality of mycelia as all-natural and low-cost bio-scaffolds, alternative to the tissue engineering systems currently in place.

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